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Note 13 - Capital Stock (Tables)
12 Months Ended
Jul. 31, 2020
Notes Tables  
Schedule of Warrants, Valuation Assumptions [Table Text Block]
Expected Risk Free Interest Rate
   
2.90
%
Expected Annual Volatility
   
63.30
%
Expected Contractual Life in Years
   
2.50
 
Expected Annual Dividend Yield
   
0.00
%
Schedule of Net Proceeds Allocation [Table Text Block]
Fair Value of Shares
  $
19,424,095
 
Fair Value of Share Purchase Warrants
   
3,094,693
 
Total Fair Value Before Allocation to Net Proceeds
  $
22,518,788
 
         
Gross Proceeds
  $
20,180,878
 
Share Issuance Costs - Cash
   
(1,211,667
)
Net Cash Proceeds Received
  $
18,969,211
 
         
Relative Fair Value Allocation to:
 
 
 
 
Shares
  $
16,362,327
 
Share Purchase Warrants
   
2,606,884
 
    $
18,969,211
 
Schedule Of Share based Compensation Warrants Activity [Table Text Block]
   
Number of
Warrants
   
Weighted Average
Exercise Price
 
Balance, July 31, 2017
   
19,676,560
    $
1.78
 
Issued
   
11,358,728
     
2.30
 
Exercised
   
(61,799
)    
1.20
 
Expired
   
(50,000
)    
1.95
 
Balance, July 31, 2018
   
30,923,489
     
1.97
 
Issued
   
7,063,253
     
2.05
 
Exercised
   
(3,999,881
)    
1.21
 
Expired
   
(3,542,951
)    
2.13
 
Exchanged for shares pursuant to Securities Exchange Agreement
   
(11,000,000
)    
2.30
 
Balance, July 31, 2019
   
19,443,910
     
1.94
 
Issued
   
300,000
     
1.38
 
Expired
   
(12,021,929
)    
1.87
 
Balance, July 31, 2020
 
 
7,721,981
   
$
2.03
 
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
 
Weighted Average
Exercise Price
   
Number of Warrants
Outstanding
   
Weighted Average
Remaining Contractual
Life (Years)
 
Expiry Date
  $ 1.25      
150,000
     
0.40
 
December 23, 2020
    1.50      
150,000
     
0.40
 
December 23, 2020
    2.05      
7,063,253
     
0.67
 
April 3, 2021
    2.30      
308,728
     
2.02
 
August 9, 2022
    1.64      
50,000
     
2.80
 
May 21, 2023
  $ 2.03      
7,721,981
     
0.73
 
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
Year Ended July 31,
 
   
2020
   
2019
   
2018
 
Expected Risk Free Interest Rate
 
 
0.40
%
   
1.86
%    
2.24
%
Expected Volatility
 
 
60.48
%
   
65.62
%    
67.60
%
Expected Life in Years
 
 
4.9
     
4.9
     
3.1
 
Expected Dividend Yield
 
 
0
%
   
0
%    
0
%
Weighted-Average Grant Date Fair Value
 
$
0.45
    $
0.53
    $
0.68
 
Share-based Payment Arrangement, Option, Activity [Table Text Block]
   
Number of Stock Options
   
Weighted Average Exercise Price
 
Balance, July 31, 2017
   
12,260,500
    $
1.33
 
Granted
   
4,083,000
     
1.40
 
Exercised
   
(1,365,625
)    
0.70
 
Forfeited
   
(66,250
)    
1.24
 
Balance, July 31, 2018
   
14,911,625
     
1.41
 
Granted
   
2,006,350
     
0.97
 
Exercised
   
(259,625
)    
1.12
 
Cancelled/Forfeited
   
(910,000
)    
2.41
 
Expired
   
(10,000
)    
1.50
 
Balance, July 31, 2019
   
15,738,350
     
1.30
 
Granted
   
6,163,900
     
0.95
 
Cancelled/Forfeited
   
(179,344
)    
1.02
 
Expired
   
(6,208,156
)    
1.39
 
Balance, July 31, 2020
   
15,514,750
    $
1.13
 
Cash Proceeds Received and Tax Benefit from Share-based Payment Awards [Table Text Block]
   
Year Ended July 31,
 
   
2020
   
2019
   
2018
 
Number of Shares Issued Upon Exercise of Options
 
 
-
     
125,879
     
1,094,589
 
Number of Options Exercised on Forfeiture Basis
 
 
-
     
193,375
     
580,625
 
Number of Net Shares Issued
 
 
-
     
59,629
     
309,589
 
Number of Options Exercised on Cash Basis
 
 
-
     
66,250
     
785,000
 
Cash Received from Exercise of Stock Options
 
$
-
    $
72,363
    $
530,050
 
Total Intrinsic Value of Options Exercised
 
$
-
    $
134,174
    $
1,049,694
 
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
   
Number of Unvested Stock Options
   
Weighted Average
Grant-Date Fair Value
 
Balance, July 31, 2017
   
765,750
    $
0.58
 
Granted
   
4,083,000
     
0.68
 
Vested
   
(1,303,000
)    
0.65
 
Forfeited
   
(66,250
)    
0.62
 
Balance, July 31, 2018
   
3,479,500
     
0.68
 
Granted
   
2,006,350
     
0.53
 
Vested
   
(2,055,250
)    
0.68
 
Forfeited
   
(120,000
)    
0.67
 
Balance, July 31, 2019
   
3,310,600
     
0.59
 
Granted
   
6,163,900
     
0.45
 
Vested
   
(2,590,154
)    
0.60
 
Cancelled/Forfeited
   
(86,875
)    
0.43
 
Balance, July 31, 2020
   
6,797,471
    $
0.46
 
Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]
     
Options Outstanding
   
Options Exercisable
 
Range of
Exercise
Prices
Outstanding
at
July 31, 2020
   
Weighted
Average
Exercise Price
   
Weighted Average
Remaining
Contractual Term
(Years)
   
Exercisable at
July 31, 2020
   
Weighted
Average
Exercise Price
   
Weighted Average
Remaining
Contractual Term
(Years)
 
$0.80
to
$0.99
 
8,169,500
    $
0.92
     
7.64
     
2,843,279
    $
0.94
     
4.03
 
$1.00
to
$1.49
 
5,005,000
     
1.19
     
3.81
     
3,533,750
     
1.22
     
1.47
 
$1.50
to
$3.28
 
2,340,250
     
1.75
     
2.59
     
2,340,250
     
1.75
     
2.59
 
 
 
 
 
15,514,750
    $
1.13
     
5.64
     
8,717,279
    $
1.27
     
2.61
 
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Grant Date
 
Number of Restricted
Stock Units
   
Grant Date
Fair Value
   
Remaining Life (Years)
   
Aggregate
Intrinsic Value
 
July 30, 2019
   
310,000
    $
0.94
     
2.00
    $
8,649
 
July 16, 2020
   
1,305,000
     
0.91
     
2.96
     
78,300
 
     
1,615,000
    $
0.92
     
2.77
    $
86,949
 
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
   
Number of Restricted Stock Units
   
Weighted Average
Grant Date Fair Value
 
Balance, July 31, 2018
   
-
    $
-
 
Granted
   
465,000
     
0.94
 
Balance, July 31, 2019
   
465,000
     
0.94
 
Granted
   
1,305,000
     
0.91
 
Vested
   
(155,000
)    
0.94
 
Balance, July 31, 2020
   
1,615,000
    $
0.92
 
Schedule of Performance Based Restricted Stock Units, Valuation Assumptions [Table Text Block]
Expected Risk Free Interest Rate
 
 1.99%
to
2.20%
Expected Volatility
 
 56.74%
to
61.75%
Expected Dividend Yield
 
 
0%
 
Expected Life in Years
 
 
3
 
Correlation
 
 
57.10%
 
Share-based Payment Arrangement, Cost by Plan [Table Text Block]
   
Year Ended July 31,
 
   
2020
   
2019
   
2018
 
Stock-Based Compensation for Consultants
 
 
 
 
 
 
 
 
 
 
 
 
Common stock issued for consulting services
 
$
539,552
    $
644,307
    $
740,640
 
Amortization of stock option expenses
 
 
240,912
     
153,549
     
582,842
 
   
 
780,464
     
797,856
     
1,323,482
 
Stock-Based Compensation for Management
 
 
 
 
 
 
 
 
 
 
 
 
Common stock issued to management
 
 
225,217
     
269,688
     
702,505
 
Amortization of stock option expenses
 
 
644,516
     
516,266
     
284,556
 
Amortization of RSU & PRSU expenses
 
 
582,785
     
-
     
-
 
   
 
1,452,518
     
785,954
     
987,061
 
Stock-Based Compensation for Employees
 
 
 
 
 
 
 
 
 
 
 
 
Common stock issued to employees
 
 
635,414
     
674,488
     
773,899
 
Amortization of stock option expenses
 
 
640,011
     
689,743
     
547,231
 
   
 
1,275,425
     
1,364,231
     
1,321,130
 
                         
Settlement of share issuance obligation
 
 
(15,189
)
   
-
     
(127,615
)
   
$
3,493,218
    $
2,948,041
    $
3,504,058